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Livermore
Livermore
ZHEN

Southeastern Asset Management (Longleaf)

Superinvestor

Southeastern Asset Management Inc

SEC CIK
0000807985
Manager
Mason Hawkins
Style
Value
Latest filing
Aug 14, 2026

AMG holding history

Affiliated Managers Group, Inc. in every 13F filed by Southeastern Asset Management (Longleaf), including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

AMG overviewAll 13F holders of AMGFull Q2 2026 holdings

Shares (Q2 2026)
5,562
Value
$1.88M
% of portfolio
0.1%
Quarters held
22
Since Q1 2021
Holdings of AMG by Southeastern Asset Management (Longleaf), by quarter
QuarterSharesValue% of portfolioShare changeActionAll holders
Q2 20265,562$1.88M0.1%00.0%UnchangedHolders
Q1 20265,562$1.54M0.1%00.0%UnchangedHolders
Q4 20255,562$1.60M0.1%−1,276−18.7%ReducedHolders
Q3 20256,838$1.63M0.1%00.0%UnchangedHolders
Q2 20256,838$1.35M0.1%−472,933−98.6%ReducedHolders
Q1 2025479,771$80.6M4.3%−222,716−31.7%ReducedHolders
Q4 2024702,487$129.9M6.1%−22,342−3.1%ReducedHolders
Q3 2024724,829$128.9M6.1%−70,420−8.9%ReducedHolders
Q2 2024795,249$124.2M5.4%−42,629−5.1%ReducedHolders
Q1 2024837,878$140.3M5.4%−44,497−5.0%ReducedHolders
Q4 2023882,375$133.6M5.1%−25,664−2.8%ReducedHolders
Q3 2023908,039$118.4M4.4%−12,996−1.4%ReducedHolders
Q2 2023921,035$138.1M4.9%−2,323−0.3%ReducedHolders
Q1 2023923,358$131.5M4.4%−8,423−0.9%ReducedHolders
Q4 2022931,781$147.6M5.2%−686,331−42.4%ReducedHolders
Q3 20221,618,112$181.0M4.6%−134,723−7.7%ReducedHolders
Q2 20221,752,835$204.4M4.3%−22,395−1.3%ReducedHolders
Q1 20221,775,230$250.2M4.4%+238,069+15.5%AddedHolders
Q4 20211,537,161$252.9M4.2%−62,600−3.9%ReducedHolders
Q3 20211,599,761$241.7M4.6%+88,728+5.9%AddedHolders
Q2 20211,511,033$233.0M4.7%+240,196+18.9%AddedHolders
Q1 20211,270,837$189.4M4.1%––Holders

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.